Abstract: A thermal management system for a space of which the temperature is to be controlled, comprising apparatus to provide a path for circulation of cooling air to the space, apparatus to provide a path for circulation of warming air to the space, and apparatus operable to induce circulation of air in either of the paths and simultaneously prevent gravity circulation of air in the other air.

Abstract: Refrigeration systems comprising a chemically and thermally stable lubricating composition having high lubricity under all operating conditions comprising (a) fluorochlorocarbon refrigerant, (b) hydrofined base oils, alkylated aromatics or refrigerator oils and (c) selected chlorinated fluorinated and/or fluoralkylated aromatics including unsubstituted and alkyl substituted chlorinated biphenyls, chlorinated polyphenyls, and chlorinated diphenyl ethers, and particularly dodecylmonochlorodiphenyloxide.

Abstract: A hot gas pressure switch 29 is provided to be responsive to pressure in a hot gas line 22 which will have a significant pressure value only during a heat or defrost mode, to unload cylinders of a transport refrigeration compressor to avoid overload, so that the compressor can operate with a substantially greater discharge pressure in a cooling mode without penalty.

Abstract: A spring biased member is disposed between the facing surfaces of the reversing eccentric and the rotor of a reversible, unidirectional flow pump. The member is keyed to the eccentric and applies frictional torque to the eccentric from the rotor to drive the eccentric to the proper position as determined by a fixed stop in accordance with the rotor's rotation. The member extends generally tangentially beyond either side of the contact points on the circular rotor face and presents a wedge-shaped confined space to the lubricant on the rotor face. The lubricant is driven into the wedge by the rotating rotor and raises the member from intimate contact with the rotor surface to maintain a thin lubricant film therebetween. This film of lubricant thus separates the member from the rotor face whenever there is relative motion between them to reduce wear on the otherwise contacting parts.